diff --git a/python/pluginResources/intellij.python.community.impl.xml b/python/pluginResources/intellij.python.community.impl.xml
index bc85ff87ab05..8ad59600a122 100644
--- a/python/pluginResources/intellij.python.community.impl.xml
+++ b/python/pluginResources/intellij.python.community.impl.xml
@@ -620,6 +620,9 @@
                        key="python.sdk.installation.notification.group"/>
     <statistics.notificationIdsHolder implementation="com.jetbrains.python.statistics.PythonInterpreterInstallationIdsHolder"/>
 
+    <notificationGroup id="Python source root detection" displayType="STICKY_BALLOON" isLogByDefault="true" bundle="messages.PyBundle"
+                       key="python.source.root.detection.notification.group"/>
+
     <toolWindow id="Python Packages" anchor="bottom"
                 icon="com.jetbrains.python.icons.PythonIcons.Python.PythonPackages"
                 factoryClass="com.jetbrains.python.packaging.toolwindow.PyPackagesToolWindowFactory"/>
diff --git a/python/pluginResources/messages/PyBundle.properties b/python/pluginResources/messages/PyBundle.properties
index e1a21b16504e..4c21a893ce41 100644
--- a/python/pluginResources/messages/PyBundle.properties
+++ b/python/pluginResources/messages/PyBundle.properties
@@ -1755,6 +1755,7 @@ pycharm.free.mode.upgrade.body=Unlock the full potential of your IDE! Boost prod
 pycharm.free.mode.upgrade.button=Purchase Subscription
 python.packaging.sync.packages=Syncing project dependencies
 python.sdk.read.only=Python SDK ''{0}'' is read-only and operation cannot be performed.
+python.source.root.detection.notification.group=Python source root detection
 read.only.python.sdk.system.wide.read.only.message=System Python packages are read-only. Select a different interpreter to modify packages.
 tracecontext.detecting.poetry.executable=Detecting Poetry Executable
 tracecontext.detecting.pip.executable=Detecting Pip Executable
diff --git a/python/python-psi-impl/resources/messages/PyPsiBundle.properties b/python/python-psi-impl/resources/messages/PyPsiBundle.properties
index 01bd40553cc2..40c556f741b4 100644
--- a/python/python-psi-impl/resources/messages/PyPsiBundle.properties
+++ b/python/python-psi-impl/resources/messages/PyPsiBundle.properties
@@ -1371,3 +1371,8 @@ INSP.unnecessary.cast.message=Unnecessary cast; type is already ''{0}''
 
 # Quick fixes for PyUnnecessaryCastInspection
 QFIX.remove.cast.call=Remove 'cast' call
+
+# Quick fix: mark directory as source root
+QFIX.add.source.root.notification.text=''{0}'' has been marked as source root.
+QFIX.add.source.root.notification.ok=Ok
+QFIX.add.source.root.notification.revert=Revert
diff --git a/python/src/com/jetbrains/python/inspections/quickfix/PyMarkDirectoryAsSourceRootQuickFix.kt b/python/src/com/jetbrains/python/inspections/quickfix/PyMarkDirectoryAsSourceRootQuickFix.kt
index 268a10f449f3..05dffce1f17e 100644
--- a/python/src/com/jetbrains/python/inspections/quickfix/PyMarkDirectoryAsSourceRootQuickFix.kt
+++ b/python/src/com/jetbrains/python/inspections/quickfix/PyMarkDirectoryAsSourceRootQuickFix.kt
@@ -7,6 +7,12 @@ import com.intellij.codeInspection.util.IntentionFamilyName
 import com.intellij.codeInspection.util.IntentionName
 import com.intellij.icons.AllIcons
 import com.intellij.ide.projectView.actions.MarkRootsManager
+import com.intellij.notification.Notification
+import com.intellij.notification.NotificationAction
+import com.intellij.notification.NotificationGroupManager
+import com.intellij.notification.NotificationType
+import com.intellij.openapi.actionSystem.AnActionEvent
+import com.intellij.openapi.application.ApplicationManager
 import com.intellij.openapi.module.Module
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.project.guessProjectDir
@@ -51,6 +57,31 @@ internal class PyMarkDirectoryAsSourceRootQuickFix(
   override fun applyFix(project: Project, descriptor: ProblemDescriptor) {
     sourceRoot.markAsSourceRoot(module)
     findCache(context)?.clearCache()
+    showNotification()
+  }
+
+  private fun showNotification() {
+    val message = PyPsiBundle.message("QFIX.add.source.root.notification.text", getPathName())
+    val group = NotificationGroupManager.getInstance().getNotificationGroup("Python source root detection")
+    val notification = group.createNotification(message, NotificationType.INFORMATION)
+
+    // Ok action just closes the notification
+    notification.addAction(NotificationAction.createSimpleExpiring(
+      PyPsiBundle.message("QFIX.add.source.root.notification.ok")
+    ) { /* no-op, expiring */ })
+
+    // Revert action removes the just added source root
+    notification.addAction(object : NotificationAction(PyPsiBundle.message("QFIX.add.source.root.notification.revert")) {
+      override fun actionPerformed(e: AnActionEvent, notification: Notification) {
+        ApplicationManager.getApplication().runWriteAction {
+          sourceRoot.unmarkAsSourceRoot(module)
+        }
+        findCache(context)?.clearCache()
+        notification.expire()
+      }
+    })
+
+    notification.notify(project)
   }
 
   private fun VirtualFile.markAsSourceRoot(module: Module) {
@@ -59,4 +90,14 @@ internal class PyMarkDirectoryAsSourceRootQuickFix(
     entry.addSourceFolder(this, JavaSourceRootType.SOURCE)
     model.commit()
   }
+
+  private fun VirtualFile.unmarkAsSourceRoot(module: Module) {
+    val model = ModuleRootManager.getInstance(module).modifiableModel
+    val entry = MarkRootsManager.findContentEntry(model, this) ?: return
+    val toRemove = entry.sourceFolders.firstOrNull { it.file == this || it.url == this.url }
+    if (toRemove != null) {
+      entry.removeSourceFolder(toRemove)
+    }
+    model.commit()
+  }
 }